VersaHex Adapters allows you to change any 1/2" Hex Bore product to either a 3/8" hex or 1/4" square shaft. This means that you can run a GT2 pulley on a 3/8" Hex Shaft, or a VEXpro Hub Sprocket on a VEX V5 High Strength Shaft. Each type of VersaHex Adapters come in 1/8" and 1/4" lengths. 48 Pack